Fixed incorrect mime-type in README.
Fixed incorrect mime-type in README.

sopheak-se/paperclip,frankpinto/paperclip,cmaion/paperclip,medcat/paperclip,raow/paperclip,mrgilman/paperclip,manorie/paperclip,victorngkp/paperclip,aditya01933/paperclip,carnivalmobile/paperclip,dgynn/paperclip,keathley/paperclip,pandamako/paperclip,raow/paperclip,rpbaptist/paperclip,rpbaptist/paperclip,dgynn/paperclip,tiegz/paperclip,bdewater/paperclip,zurb/paperclip,mdkalish/paperclip,gfvcastro/paperclip,alexandrz/paperclip,gfvcastro/paperclip,maintux/paperclip,cmaion/paperclip,freeslugs/paperclip,sopheak-se/paperclip,aditya01933/paperclip,onursarikaya/paperclip,Cohealo/paperclip,mrgilman/paperclip,InesCARodrigues/paperclip,carnivalmobile/paperclip,maintux/paperclip,Cohealo/paperclip,greatbody/paperclip,bdewater/paperclip,soramugi/paperclip,pandamako/paperclip,mrb/paperclip,tylerwillingham/paperclip,Sporky023/paperclip,betesh/paperclip,mdkalish/paperclip,frankpinto/paperclip,onursarikaya/paperclip,mehulkar/paperclip,victorngkp/paperclip,ScotterC/paperclip,danielwanja/paperclip,mrb/paperclip,tiegz/paperclip,joshisa/paperclip,tylerwillingham/paperclip,freeslugs/paperclip,keathley/paperclip,greatbody/paperclip,betesh/paperclip,joshisa/paperclip,alexandrz/paperclip,zurb/paperclip,medcat/paperclip,InesCARodrigues/paperclip,Sporky023/paperclip,sideci-sample/sideci-sample-paperclip,justanshulsharma/paperclip,soramugi/paperclip,justanshulsharma/paperclip,ScotterC/paperclip,manorie/paperclip,mehulkar/paperclip